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CD1677 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, thread_class: 2A SINGLE THREADED PORTION A, thread_length: 0.875 INCHES NOMINAL SINGLE THREADED PORTION IN, overall_height: 0.875 INCHES NOMINAL IN, style_designator: PLAIN THREADED, nominal_thread_size: 4.125 INCHES SINGLE THREADED PORTION IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-420-6845, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
CD1677
NSN: 4820-00-420-6845
FSC: 4820
CAGE: 93232 — CURTISS-WRIGHT ELECTRO-MECHANICAL CORPORATION DBA CURTISS WRIGHT ENGINEERED PUMP DIVISION USE CAGE CODE 0UBG9 FOR CATALOGING (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thread_class2A SINGLE THREADED PORTION A
thread_length0.875 INCHES NOMINAL SINGLE THREADED PORTION IN
overall_height0.875 INCHES NOMINAL IN
special_features5 LIGHTENING HOLES EQUALLY SPACED 1.188IN. BY 1.688 IN.; CENTER HOLE 9/16-12 UNC THDW/COUNTER BORE 11/16 IN. DIA BY 3/32 IN. DEEP ONONE @END OF CENTER HOLE IN
style_designatorPLAIN THREADED
nominal_thread_size4.125 INCHES SINGLE THREADED PORTION IN
body_inside_diameter0.562 INCHES NOMINAL IN
seating_surface_shapeFLAT
thread_quantity_per_inch12 SINGLE THREADED PORTION
thread_series_designatorUN SINGLE THREADED PORTION
NSN4820-00-420-6845
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: CD1677 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NOMINAL THREAD SIZE: 4.125 INCHES SINGLE THREADED PORTION IN
•
THREAD LENGTH: 0.875 INCHES NOMINAL SINGLE THREADED PORTION IN
•
BODY INSIDE DIAMETER: 0.562 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY OVERALL
•
STYLE DESIGNATOR: PLAIN THREADED
•
THREAD SERIES DESIGNATOR: UN SINGLE THREADED PORTION
•
SEATING SURFACE SHAPE: FLAT
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE4.125 INCHES SINGLE THREADED PORTION IN
THREAD LENGTH0.875 INCHES NOMINAL SINGLE THREADED PORTION IN
BODY INSIDE DIAMETER0.562 INCHES NOMINAL IN
MATERIALCOPPER ALLOY OVERALL
STYLE DESIGNATORPLAIN THREADED
THREAD SERIES DESIGNATORUN SINGLE THREADED PORTION
SEATING SURFACE SHAPEFLAT
SPECIAL FEATURES5 LIGHTENING HOLES EQUALLY SPACED 1.188IN. BY 1.688 IN.; CENTER HOLE 9/16-12 UNC THDW/COUNTER BORE 11/16 IN. DIA BY 3/32 IN. DEEP ONONE @END OF CENTER HOLE IN
THREAD QUANTITY PER INCH12 SINGLE THREADED PORTION
THREAD CLASS2A SINGLE THREADED PORTION A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
1-677Interchangeable
interchangeable cross-reference
interchangeable
9020352Interchangeable
interchangeable cross-reference
interchangeable
7131677-00Interchangeable
interchangeable cross-reference
interchangeable
7901001-01Interchangeable
interchangeable cross-reference
interchangeable
5962PL0912583Interchangeable
interchangeable cross-reference
interchangeable
43001127-000Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is CD1677?
CD1677 is a SEAT,VALVE.
What parts can replace CD1677?
There are 15 known substitutes for CD1677: 1-677, 9020352, 7131677-00 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for CD1677?
CD1677 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-420-6845. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026